| 引用本文: | 胡正伟,贺冬梅,谢志远.基于FastICA算法的电力线通信OFDM信号分离方法[J].电力自动化设备,2019,39(12): |
| HU Zhengwei,HE Dongmei,XIE Zhiyuan.OFDM signal separation method for power line communication based on FastICA algorithm[J].Electric Power Automation Equipment,2019,39(12): |
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| 摘要: |
| 提出了一种基于快速独立成分分析(FastICA)算法的电力线通信正交频分复用(OFDM)技术信号分离方法。该方法在FastICA算法对2路观测信号进行解混处理的基础上，将解混信号的前导字段幅度归一化后分别与OFDM符号的前导序列的对应字段进行互相关，取相关值中最大值较大的解混信号作为通信信号，实现了通信信号和噪声的正确识别。定义分离比值为2路相关值中最大值的比值，作为解混效果的评价标准。通过设置合适的分离比值阈值，实现了期望的解混效果。以解混信号的前导字段为参考相位，采用DBPSK调制解调方式，实现了接收数据与解混信号相位无关。建立了MATLAB通信系统仿真模型，仿真结果验证了该方法在低信噪比条件且无纠错编码功能时仍具有较好的通信效果。最后基于硬件平台对算法的可实现性进行了验证测试。 |
| 关键词: 电力线通信 FastICA算法 同步 信噪分离 正交频分复用 |
| DOI：10.16081/j.epae.201911027 |
| 分类号:TM734 |
| 基金项目:国家自然科学基金青年科学基金资助项目(61601182)；现代电子信息网络创新创业实践基地建设项目(2017CXCY135)；河北省科技计划项目(17211704D) |
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| OFDM signal separation method for power line communication based on FastICA algorithm |
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HU Zhengwei, HE Dongmei, XIE Zhiyuan
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School of Electrical & Electronic Engineering, North China Electric Power University, Baoding 071003, China
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| Abstract: |
| An OFDM(Orthogonal Frequency Division Multiplexing) signal separation method for power line communication based on FastICA(Fast Independent Component Analysis) algorithm is proposed. On the basis of the separation of the two path observation signals by FastICA algorithm, the amplitude of the preamble field of the unmixed signal is normalized and interrelated with the corresponding fields of the lea-ding sequence of the OFDM symbol respectively, and taking the unmixed signal with the largest correlation value as the communication signal, the correct recognition of communication signal and noise is realized. The separation ratio is defined as the ratio of the maximum value of the two correlation values, which is used as the evaluation criterion for the unmixed effect. By setting the appropriate threshold of separation ratio, the desired unmixed effect is achieved. Using the preamble field of the unmixed signal as the reference phase, the DBPSK modulation and demodulation method is used to achieve the reception data unrelated to the phase of the unmixed signal. A MATLAB communication system simulation model is built, and the effectiveness of the proposed method under the condition of low SNR(Signal Noise Ratio) without error correction coding is confirmed. The realizability of the proposed algorithm is verified and tested based on hardware platform. |
| Key words: power line communication FastICA algorithm synchronization separation of signal and noise OFDM |
